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Execution failed for task ':bootJarMainClassName'.
> Unable to find a single main class from the following candidates
main class가 하나가 아닐때 나는 오류였다.
build.gradle에 아래와 같이 main class를 지정해주면 된다.
springBoot {
mainClass = 'com.tickettogether.TickettogetherApplication'
}